EE100Su08 Lecture 13 July 25th 2008 Outline MultiSim licenses postponed to Monday July 28th 2008 Apparently our license number is not working Thanks for coming to lecture today HW 2 regrade deadline Monday 07 28 5 00 pm PST Midterm 1 regrades I will finish em by office hours today QUESTIONS Strain Gauge and Project Lab Lecture WARNING BE REALLY CAREFUL AROUND THE STRAIN GAUGE SINCE THE APPARATUS STICKS OUT OF THE TABLE Frequency Response and Bode plots Nonlinear circuits Reading Chapter 9 from your book skip 9 10 9 11 duh Appendix E skip second order resonance bode plots Chapter 1 from your reader skip second order resonance bode plots EE100 Summer 2008 Slide 1 Bharathwaj Muthuswamy EE100 Summer 2008 Slide 2 Bharathwaj Muthuswamy EE100 Summer 2008 Slide 3 Bharathwaj Muthuswamy EE100 Summer 2008 Slide 4 Bharathwaj Muthuswamy EE100 Summer 2008 Slide 5 Bharathwaj Muthuswamy EE100 Summer 2008 Slide 6 Bharathwaj Muthuswamy Example Circuit R2 AVT VIN R1 VT C TransferFu nction VOUT VIN VOUT AZ c VIN Z R Zc VOUT A 100 R1 100 000 Ohms R2 1000 Ohms C 10 uF VOUT A 1 jwC A VIN R2 1 j C 1 j R2C EE100 Summer 2008 Slide 7 Bharathwaj Muthuswamy Example Circuit R2 AVT VIN R1 VT C VOUT A 100 R1 100 000 Ohms R2 1000 Ohms C 10 uF EE100 Summer 2008 Slide 8 Bharathwaj Muthuswamy Example Circuit R2 AVT VIN R1 VT C VOUT A 100 R1 100 000 Ohms R2 1000 Ohms C 10 uF EE100 Summer 2008 Slide 9 Bharathwaj Muthuswamy Break Point Values When dealing with resonant circuits it is convenient to refer to the frequency difference between points at which the power from the circuit is half that at the peak of resonance Such frequencies are known as half power frequencies and the power output there referred to the peak power at the resonant frequency is 10log10 Phalf power Presonance 10log10 1 2 3 dB EE100 Summer 2008 Slide 10 Bharathwaj Muthuswamy Magnitude Example Circuit in Slide 2 Magnitude A 100 R2 1000 Ohms C 10 uF 1000 100 A VOUT A VIN 1 j R2C wp 1 R2C 100 Actual value 10 100 100 1 j 2 1 0 1 EE100 Summer 2008 1 10 100 1000 Slide 11 Radian Frequency Bharathwaj Muthuswamy Magnitude in dB Bode Plot Label as dB VOUT A VIN 1 j R2C A 100 R2 1000 Ohms C 100 uF 60 A 40 wp 1 R2C 100 20 0 20 1 10 100 1000 Radian Frequency Note Magnitude in dB 20 log10 VOUT VIN EE100 Summer 2008 Slide 12 Bharathwaj Muthuswamy
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